Sofa



FIG. 1 is a front perspective view of a sofa showing my new design;

FIG. 2 is another front perspective view thereof;

FIG. 3 is a top plan view thereof;

FIG. 4 is a front perspective view thereof with the sofa in an alternate configuration;

FIG. 5 is another front perspective view thereof; and,

FIG. 6 is a front perspective view thereof with the sofa in a further alternate configuration. 

I claim, the ornamental design for a sofa, as shown and described. 